<template>
    <div>
       <!-- 面包屑导航 -->
          <el-breadcrumb separator="/">
             <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
             <el-breadcrumb-item>商品管理</el-breadcrumb-item>
             <el-breadcrumb-item>参数列表</el-breadcrumb-item>
          </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
            <!--警告区域 -->
            <el-alert
              title="注意：只允许为第三级分类设置相关的参数"
              type="warning" show-icon :closable="false">
            </el-alert>
            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品的级联选择框 -->
                    <el-cascader
                       
                       v-model="selectedCatekeys"
                       :props="cateprops"
                       :options="catelist"
                       @change="handleChange">
                    </el-cascader>
                </el-col>
            </el-row>

            <!-- tab标签页 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
              <!-- 添加动态参数的面板 -->
              <el-tab-pane label="动态参数" name="many">
                  <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                  <!-- 动态参数把表格 -->
                  <el-table :data="manyTableData" border stripe>
                      <!-- 展开行 -->
                      <el-table-column type="expand">
                          <!-- 作用域插槽 -->
                          <template slot-scope="scope">
                              <!-- 循环渲染tag标签 -->
                              <el-tag v-for="(item,i) in scope.row.attr_vals"  :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                              <!-- 输入的文本框 -->
                              <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                              >
                              </el-input>
                              <!-- 添加按钮 -->
                              <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                          </template>
                      </el-table-column>
                      <!-- 索引列 -->
                      <el-table-column type="index"></el-table-column>
                      <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                      <el-table-column label="操作">
                         <template slot-scope="scope">
                            <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                         </template>
                      </el-table-column>
                  </el-table>
              </el-tab-pane>
              <!-- 添加静态属性的面板 -->
              <el-tab-pane label="静态属性" name="only">
                  <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                  <!-- 静态属性表格 -->
                  <el-table :data="onlyTableData" border stripe>
                      <!-- 展开行 -->
                      <el-table-column type="expand">
                          <!-- 作用域插槽 -->
                          <template slot-scope="scope">
                              <!-- 循环渲染tag标签 -->
                              <el-tag v-for="(item,i) in scope.row.attr_vals"  :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                              <!-- 输入的文本框 -->
                              <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                              >
                              </el-input>
                              <!-- 添加按钮 -->
                              <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                          </template>
                      </el-table-column>
                      <!-- 索引列 -->
                      <el-table-column type="index"></el-table-column>
                      <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                      <el-table-column label="操作">
                          <template slot-scope="scope">
                               <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                               <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)" >删除</el-button>
                          </template>
                      </el-table-column>
                  </el-table>
              </el-tab-pane>
            </el-tabs>
        </el-card>

        <!-- 添加参数的对话框 -->
        <el-dialog
          :title="'添加'+titleText"
          :visible.sync="addDialogVisible"
          width="50%" @close="addDialogClosed"
          >
         <!-- 添加参数的对话框 -->
         <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
              <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
         </el-form>
          <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
          </span>
        </el-dialog>

        <!-- 修改的对话框 -->
        <el-dialog
          :title="'修改'+titleText"
          :visible.sync="editDialogVisible"
          width="50%" @close="editDialogClosed"
          >
         <!-- 添加参数的对话框 -->
         <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
              <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
         </el-form>
          <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
          </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data(){
        return{
          //商品分类列表
          catelist:[],
          //级联选择框的配置对象
          cateprops:{
              value:'cat_id',
              label:'cat_name',
              children:'children',
              expandTrigger:"hover"
          },
           //级联选择框双向绑定的事件
          selectedCatekeys:[],
           //被激活的页签名称
          activeName:'many',
          //动态参数的数据
          manyTableData:[],
          //静态属性的数据
          onlyTableData:[],
          //控制添加对话框的显示与隐藏
          addDialogVisible:false,
          addForm:{
              attr_name:''
          },
          addFormRules:{
              attr_name:[{required:true,message:'请输入用户邮箱',
              trigger:'blur'}]
          },
          //显示编辑对话框的显示与隐藏
          editDialogVisible:false,
          //修改的表单数据对象
          editForm:{
             
          },
          //修改表单的验证规则
          editFormRules:{
              attr_name:[{required:true,message:'请输入用户邮箱',
              trigger:'blur'}]
          }
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        // 获取所有商品分类列表
        async getCateList(){
           const {data:res}=await this.$http.get(`categories`)
           //判断
           if(res.meta.status!==200){
               return this.$message.error('获取商品分类失败')
           }
           this.catelist=res.data
        //    console.log(this.catelist);
           
        },
        // 级联选择框发生变化会触发的函数
        handleChange(){
           this.getParamsData()
            
        },
        // tab页签点击事件的处理函数
        handleTabClick(){
           console.log(this.activeName);
           this.getParamsData()
           
        },
        // 获取参数的列表数据
        async getParamsData(){
             // console.log(this.selectedCatekeys);
            // 证明选择的不是三级分类
            if(this.selectedCatekeys.length!==3){
                this.selectedCatekeys=[]
                this.manyTableData=[]
                this.onlyTableData=[]
                return 
            }
            
            // 证明是三级分类
            console.log(this.selectedCatekeys);

            // 根据所选分类的ID，和当前所处的面板，获取对应的参数
            const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{
                params:{sel:this.activeName}
            })
            if(res.meta.status!==200){
                return this.$message.error('获取参数列表失败')
            }
            res.data.forEach(item=>{
                item.attr_vals=item.attr_vals?
                item.attr_vals.split(' '):[]
                //控制文本框的显示与隐藏
                item.inputVisible=false
                //文本框输入的值
                item.inputValue=''
            })
            // console.log(res.data);
            if(this.activeName==='many'){
               this.manyTableData=res.data
            }else{
                this.onlyTableData=res.data
            }

        },
        // 监听添加对话框的关闭事件,重置表单数据
        addDialogClosed(){
           this.$refs.addFormRef.resetFields()
        },
        addParams(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid)return
                const {data:res}=await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name:this.addForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status!==201){
                  return this.$message.error('添加参数失败')
                }
                this.$message.success('添加参数成功')
                this.addDialogVisible=false
                this.getParamsData()
            })
        },
        // 点击按钮，展示修改对话框
        async showEditDialog(attr_id){
            // 查询当前参数的信息
            const {data:res}= await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{params:{attr_sel:this.activeName}})
            // const{data:res}=await this.$http.get(`categories/$
            // {this.cateId}/attributes/${attr_id}`,{
            //     params:{attr_sel:this.activeName}
            // })
                     console.log(res);
            if(res.meta.status!==200){
                return this.$message.error('获取参数信息失败')
            }
   
            
            this.editForm=res.data
            this.editDialogVisible=true
        },
        //重置修改的表单
        editDialogClosed(){
          this.$refs.editFormRef.resetFields()
        },
        //点击按钮，修改参数信息
        editParams(){
           this.$refs.editFormRef.validate(async valid=>{
              if(!valid)return 
              const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
              {attr_name:this.editForm.attr_name,attr_sel:this.activeName})

              if(res.meta.status!==200){
                  return this.$message.error('修改参数失败')
              }

              this.$message.success('修改参数成功')
              this.getParamsData()
              this.editDialogVisible=false
           })
        },
        // 根据ID删除参数值
        async removeParams(attr_id){
          const confirmResult=await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err=>err)
         //用户取消了删除操作
        if(confirmResult!=='confirm'){
            return this.$message.info('取消这次删除')
        }
        //删除的操作
        const {data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if(res.meta.status!==200){
           return this.$message.error('删除参数失败')
        }
        this.$message.success('删除参数成功')
        this.getParamsData()
        },
        //文本框失去焦点或者按下时触发的事件
        handleInputConfirm(row){
            if(row.inputValue.trim().length===0){
              row.inputValue=''
              row.inputVisible=false
              return 
            }
             //如果不是return，则说明输入了真实的内容，需要做后续的操作
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue=''
            //隐藏文本输入框
            row.inputVisible=false
            
            this.saveAttrVals(row)
            
        },
        //将对attr_vals的操作保存到数据库
        async saveAttrVals(row){
          //需要发送请求，保存这次操作
            const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/
            ${row.attr_id}`,{
               attr_name:row.attr_name ,
               attr_sel:row.attr_sel,
               attr_vals:row.attr_vals.join(' ')
            })
            if(res.meta.status!==200){
               return this.$message.error('修改参数项失败')
            }
            this.$message.success('修改参数项成功')
        },
        //点击按钮，展示文本输入框
        showInput(row){
            row.inputVisible=true
            //让文本框自动获得焦点
            // $nextTick当页面上的元素被重新渲染之后，才会指定回调函数中的代码
            this.$nextTick(_=> {
              this.$refs.saveTagInput.$refs.input.focus();
            })
        },
        //点击删除参数项
        handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
    },
    // 计算属性
    computed:{
        // 如果按钮需要被禁用，则返回true,否则返回false
        isBtnDisabled(){
            if(this.selectedCatekeys.length!==3){
                 return true
            }
            return false
        },
        // 当前选中的三级分类的ID
        cateId(){
            if(this.selectedCatekeys.length===3){
              return this.selectedCatekeys[2]
            }
            return null
        },
        // 动态计算标题的文本
        titleText(){
            if(this.activeName==='many'){
              return '动态参数'
            }
            return '静态属性'
        }
    }
}
</script>


<style lang="less" scoped>
.cat_opt{
    margin: 15px 0;
}
.el-tag{
    margin:10px;
}
.input-new-tag{
    width:120px;
}
</style>

